fix: avoid returning output when using input grpc method

[germa89]

Description

Just checking

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.34%. Comparing base (4c6e65a) to head (c320746).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3759      +/-   ##
==========================================
- Coverage   88.35%   88.34%   -0.01%     
==========================================
  Files         187      187              
  Lines       14704    14719      +15     
==========================================
+ Hits        12991    13003      +12     
- Misses       1713     1716       +3     

[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬